Yea, it did take a while, probably a month or two to start seeing the difference, but it also depends on how often you bathe your dog, we bath every 2 weeks usually, but I also changed their food to Fromms Beef Frittata, so could also have been a combination of both. I just found that their skin, and fur felt softer after a ACV rinse, and they smelled better for longer in between baths, and I was wondering if maybe the build up of soap on the fur may cause yellowing, so the ACV rinse helps with that too.